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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7be01e8cadf5110048c90034ab303dbcb6171562038a68f7e5c78f59b3acc7' 
  AND token = 'ad+r7n7hU0hGAVrG4qbySstsHKwYeqDDl+hcoTLQCdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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