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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b7178b2fcff4693c0f020804aee587583d9e6ebbe0d9af17812f09a6004a27' 
  AND token = 'q24JPiCk/TVuQD0vde48Q3WpRf7T6VpmD57eE+VuSag=' 
  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"
    }
  }
}