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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a94b68bacf09da8dcdcb1748cd8efb1d735eb664c64ed6fe3d869cd39b7820' 
  AND token = 'Dee7LNBGSKBEIfUUTXm7wFR69fflj2hJlS2r5vCC7O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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