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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd5353654e4d2c14224e2234d506dd0a8c2031f7c00f8d3651c2656b4a0649b' 
  AND token = 'huqM0U6FTws979bMbltbpL7h7KgSHzdLW+hM25ZuSD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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