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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e6fb9d39716194ef376ba5377353e9224c13b19f13e16d839ffef7f321e3a7' 
  AND token = 'KcfEOJQQNv3kQWXHtlza4u4/DUZ7S0YQkil9neBWWC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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