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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde73ba13df16862c1fc0d3a35e5b0ec26b94f04fd40224cb7025d382d04931f' 
  AND token = 'iwmsm4eIpiyvkgHMTBeROz6l44dZJ1MLaYx/b+TPrk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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