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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f0c81fd934bf210940ae38732bc4f423f9454fdbe29475aad94e0cbdf652cb' 
  AND token = 'j5qeij8EThCY12eOVHlrT55jZJ8r8+xDX2EBsCM2aiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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