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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b990fd97da8c708f5e3390caa94e27412a98e75beb6c8439a863088c8102b7' 
  AND token = '/n7ZvVUOgD7Ya7jYpdN6UDmXtDi0gV5kJNsf0n+Z48g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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