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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61172f12380428d9a23a8a148cb1b9aee0ebf1dcb114fd4573ea966bf9968cc6' 
  AND token = 'ue8+gEeSFKpSl7RK8QBJqxVz47sFD/65hcTxhI7oc+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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