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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b4ba9c995c56be817da10837c778b0b869b4a362f5271e4a46f409587a3a81' 
  AND token = 'QiKqckcPK6rAgp5ENsqX2I8KfYl0B/K0cb9yey6ktzo=' 
  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"
    }
  }
}