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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ab3ad24e396fdc91d427421191259f3bc639f992dd3cdd06ad28ddae6e59c3' 
  AND token = 'HthuRXscyh47IjNOFX1sLF6GnMOhh3ktImbGcOJ07MA=' 
  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"
    }
  }
}