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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabc2ed528b541a8a5eee77cc4072dd0027fc24c21a52f4341fac93f5e1a9d2d' 
  AND token = 'CDYq3XSYDm78l58RTvwPLvQMX4U6SRNFDJ84rn4anLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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