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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d5ec250541bc05c91c94efbfe6754a74680c0bd80e2ff5daa0dc564358e8b4' 
  AND token = 'Lfp19w6aG4XY5SCiJAo4+ooY6XWn4OHx+eoR6FZvmo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}