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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9a7e6eb549b12b517be3a9004fa3e4fa59779d4a39f60a2e62c9911a4a8a7c' 
  AND token = 'q3FrApx7csQ9sB2sfbqXnajWzoA6sqHjlKNpLf7LqXc=' 
  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"
    }
  }
}