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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb07255e1aba6b868267a3bac39a140adaf89df179a81d18394d7456cd2f039' 
  AND token = 'FD9GOwLSwS29HnQwqbun3gQg5ajUn9E0LYiU/xz2ur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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