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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8784e0e05f14489c3e06338a940085141d0bc9d5520ae774518be133ec494c38' 
  AND token = 'MGv57SKn27yuloVY3DOqQt+nfFsONhNE237g1adBkbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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