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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81dd5db15071f57d812588e8e7082f8240f94755cf50b3df4af9a2f65c897732' 
  AND token = 'Og7zweAzBe0RKuqk0iJW08jVnxZq9qdF6t2N0yX/8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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