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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5cc9f83a9cad52814a71b41ae40d6057fd9f4130b456acacd941d5ce8f8824' 
  AND token = 'DfoPBJDRP0jdZldnENUefpA1iyXAu14S0vphuCc7SNE=' 
  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"
    }
  }
}