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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3349e5d8bc17e50f14f08ecf3fb13bbf9815a1d00028da12d24d47e2c48795' 
  AND token = 'VYS1Io5pJ/oQ3ntY9Ap2NuBEU8Qz2nM0aCEikt2lZeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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