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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352e6c9e8971d8450187513810b49f6bc4c378f26e19d4f09043d53bdd796695' 
  AND token = '95M9noWxqeV11RstaanAU9NA96QTBRsZlxRX5CEtSkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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