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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fb0ada6b9ee31276424385e3fe9070780e06a03b6aca4b6cc6e4f8c8ea2e84' 
  AND token = '9dOB/vhNusLrvEtdKSBQ8N6RTjkA0J0Mvpaw8mdjc/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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