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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b9aa3d28a055eb694f6448f66dea0c6ab5997bd78d154fa54a33ab848bec62' 
  AND token = 'UUY6VIe6yThk51Q08j42v0VvI7oKOzbTgPvEAiuxyRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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