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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39f13cd027e0ff9678e3d0e4160ac18bed1e1a8967ea6fd785709a9ae60ac1a' 
  AND token = '7ofYI3GyRltgVHE4xL4+xusDoZA75PH4pvsoh6G5rmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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