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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17de04fd741ed22f8ca39d86e0a1fb92e2ad698bfd72f5e5929d23bd5772bf5b' 
  AND token = 'P7dfb02pYzHaFvahZ5Npb0M5vxHZF2U8k6OrU3PZNu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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