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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681918c07afa228e1159da3c15e6e908b2629c8b53c5156826e7d9bf096e13ac' 
  AND token = 'wPMBhgsW8crA2APH7F+kK+NXKG4ZIB2fiPVbao3uvgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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