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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9ba934b94bd30edfdd5a6f0dfab32a1a1b4a83ee4e3dbda02461bab366945c' 
  AND token = 'kSMM/8V+MDj1qmjDJuBakT4j5QpaBllrWp8sT2+iGMw=' 
  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"
    }
  }
}