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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bc56fb7ea52aa0fa47f4e21b77d54c395682e763bff6b0c756bd4fd21756fb' 
  AND token = '8b+kr2u+gPkWoqAOBCTWa7HJvXbqOAeqBZR76VoN858=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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