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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8316ffecfe2b9359d96d597eb48c751efcb539c1d3f50bf9dcb1fd60c90d7ba' 
  AND token = 'gcOdHDjqw6m7YRigWnZEs8MMpHOq5eK8NUjGiXy+3yc=' 
  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"
    }
  }
}