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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ca72555adead1ad6b1dcf0b0df317cf3dddbfe7ad0fb9bf722a86b3f1202b7' 
  AND token = 'p9cW4b1A2i6pTcHVZSWo4DT/DbDPiwP3/Mm/cWupdRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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