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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5276a8903e531476e17707890d2e48de0c773582fdf4a96ba3df471e96a676' 
  AND token = 'ugd2yhZ0/lIVyMf+KszjghrIMSHc21Ds3OB0z8oqmo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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