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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19840e99c06f5eaa627ae2510c2d83e50f80de19f49be23d31353bb49a9f14c' 
  AND token = 'CNwL6Ai/AijmGvBkNZhFkemXEI0pm1UJkZ67txMTe4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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