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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323defb90f722e4bf9c7288b548c1d3e43b3d109aac52fd493c02ef682b4a0bd' 
  AND token = 'z2aT8pih/xwjZ6LABs2mvI7Kw9Nci7Zxpq5l2O0fudk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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