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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aebcde5ae7d40183b5e9bb78278882c7757ad5c04288e80e11d4d6001ecf4c8' 
  AND token = 'usP5TLsEfREvBHafzF1gFXh6VlccDV7Ge/XJByFShTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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