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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62bf2069db23276919119ba87387ae1631529a3e1b6a4b149ab870940aa86f5' 
  AND token = 'zrpI7GIQWLU1LLrG6X8fXCCkRxhu5Z0YyXPRoBrseq0=' 
  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"
    }
  }
}