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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd2ac57c0ed57e1abc079ca3b5c1a81dee9227cd0a6000bf21186eefc479dc9' 
  AND token = 'O0YVbAYZ9tZCuAR2CPZ4klKmIWLJYlBiCQdorB6dpcs=' 
  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"
    }
  }
}