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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9b5abf20ec88e44efb2a5d60d9778149ae347f7eea4ec9595e15ee29ac0d27' 
  AND token = 'he7DRdieZc2ZakTeBrxYLDbQ6NvyvoQgs71WfpphuPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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