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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e374de521fe14732f1d4844411f4b579bdc74436acf25077c163a0b2a9b826d' 
  AND token = 'DDKqBDAtaZeW0PA2w/WwP3Lro+Udsw824U832OdG+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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