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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4878fa6d42af8d58844d5ca0f5319d25039072064a9f5db9abbf30b5b38f6628' 
  AND token = '3205aHJ07xC06nJi6jqTH0u2x26Rydb8c+tO2qfK14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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