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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c70e965fc21654357812832e76cc58f9d8f064398b8f53d5bd31d61f0cf9a6' 
  AND token = 'aNEWoggBjjJ3CoEtsKSC0jIn2y9Zadw37QRBzd/HGIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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