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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcb1b8b65172405e81c5277f015e888257cccc7876c6656e4bfbf91e0cf06e4' 
  AND token = '5qoYAF4RgC6FdwVNFW65XCAJlfCP0wP3Yafls2wEt2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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