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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baec4a33dc1d6d272150946b658d00e5a2264f4bbcd23556f1e42fd0f7610ef6' 
  AND token = 'zXse5bMCoKmA0xhlTsjG4jCmZMEJtX4kFCoJLkssvjo=' 
  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"
    }
  }
}